/*
 *  Copyright 2006 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.mybatis.generator.internal.rules;

import org.mybatis.generator.api.IntrospectedTable;

/**
 * This class encapsulates all the code generation rules for a table using the
 * conditional model. In this model we do not generate primary key or record
 * with BLOBs classes if the class would only hold one field.
 * 
 * @author Jeff Butler
 * 
 */
public class ConditionalModelRules extends BaseRules {

	/**
     * 
     */
	public ConditionalModelRules(IntrospectedTable introspectedTable) {
		super(introspectedTable);
	}

	/**
	 * We generate a primary key if there is more than one primary key field.
	 * 
	 * @return true if the primary key should be generated
	 */
	public boolean generatePrimaryKeyClass() {
		return introspectedTable.getPrimaryKeyColumns().size() > 1;
	}

	/**
	 * Generate a base record if there are any base columns, or if there is only
	 * one primary key coulmn (in which case we will not generate a primary key
	 * class), or if there is only one BLOB column (in which case we will not
	 * generate a record with BLOBs class).
	 * 
	 * @return true if the class should be generated
	 */
	public boolean generateBaseRecordClass() {
		return introspectedTable.getBaseColumns().size() > 0 || introspectedTable.getPrimaryKeyColumns().size() == 1
				|| (introspectedTable.getBLOBColumns().size() > 0 && !generateRecordWithBLOBsClass());

	}

	/**
	 * We generate a record with BLOBs class if there is more than one BLOB
	 * column. Do not generate a BLOBs class if any other super class would only
	 * contain one field
	 * 
	 * @return true if the record with BLOBs class should be generated
	 */
	public boolean generateRecordWithBLOBsClass() {
		int otherColumnCount = introspectedTable.getPrimaryKeyColumns().size()
				+ introspectedTable.getBaseColumns().size();

		return otherColumnCount > 1 && introspectedTable.getBLOBColumns().size() > 1;
	}
}
